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Entropy Generation Minimization for Reverse Water Gas Shift (RWGS) Reactors.

Lei Zhang1,2,3, Lingen Chen1,2,3, Shaojun Xia1,2,3

  • 1Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan 430033, China.

Entropy (Basel, Switzerland)
|December 3, 2020
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Summary
This summary is machine-generated.

Optimizing reverse water gas shift (RWGS) reactor design significantly reduces entropy generation rate (EGR) by up to 23%. This thermal design enhancement improves efficiency for fuel synthesis in naval and commercial applications.

Keywords:
entropy generation minimizationfinite-time thermodynamicsgeneralized thermodynamic optimizationreverse water gas shifttubular reactor

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Area of Science:

  • Chemical Engineering
  • Thermodynamics
  • Reactor Design

Background:

  • Reverse Water Gas Shift (RWGS) reactors are crucial for fuel synthesis.
  • Thermal design and optimization are key challenges due to irreversibilities.
  • Existing designs often use simplified operational parameters.

Purpose of the Study:

  • To minimize total entropy generation rate (EGR) in RWGS reactors.
  • To apply finite time thermodynamics and entropy generation minimization theory.
  • To compare optimized designs with conventional reactor configurations.

Main Methods:

  • Utilized optimal control theory to minimize EGR under specific conditions.
  • Analyzed irreversibilities from heat transfer, chemical reaction, and viscous flow.
  • Compared optimized configurations against linear, constant temperature, and constant heat flux operations.

Main Results:

  • Achieved up to 23% reduction in EGR through simultaneous optimization.
  • Identified that reducing heat transfer irreversibility is the primary optimization driver.
  • Optimal operating paths exhibit stable thermal and chemical forces.

Conclusions:

  • Simultaneous optimization of temperature profiles, inlet temperature, and reactor length is effective.
  • A conceptual sandwich structure design is proposed for compact modular reactors.
  • Findings offer practical guidelines for industrial RWGS reactor design.